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#include <stdio.h>
#include <stdint.h>
#include <time.h>
#include <string.h>
#include "../alpha_mmintrin.h"
#define ITERATIONS 10000
#define ARRAY_ELEMENTS 512
#define ARRAY_SIZE (ARRAY_ELEMENTS * sizeof(uint64_t))
int main(int argc, char ** argv) {
uint64_t a[ARRAY_ELEMENTS], b[ARRAY_ELEMENTS], c[ARRAY_ELEMENTS];
struct timespec cix_start, cix_end;
double cix_t0, cix_t1, cix_total;
struct timespec noncix_start, noncix_end;
double noncix_t0, noncix_t1, noncix_total;
int i, j;
srand(time(NULL));
for (i = 0; i < ARRAY_ELEMENTS; i++) {
a[i] = rand();
}
clock_gettime(CLOCK_MONOTONIC, &cix_start);
for (j = 0; j < ITERATIONS; j++) {
for (i = 0; i < ARRAY_ELEMENTS; i++) {
uint64_t l1 = a[i];
uint64_t l2 = 1 << (64 - __ctlz(l1));
b[i] = l2;
}
}
clock_gettime(CLOCK_MONOTONIC, &cix_end);
clock_gettime(CLOCK_MONOTONIC, &noncix_start);
for (j = 0; j < ITERATIONS; j++) {
for (i = 0; i < ARRAY_ELEMENTS; i++) {
uint64_t l1 = a[i];
uint64_t l2;
int count = 0;
while (l1 != 0) {
l1 >>= 1;
count += 1;
}
l2 = 1 << count;
c[i] = l2;
}
}
clock_gettime(CLOCK_MONOTONIC, &noncix_end);
cix_total = (double)((cix_end.tv_sec - cix_start.tv_sec) + ((cix_end.tv_nsec - cix_start.tv_nsec) / 1.0e9)) / ITERATIONS;
noncix_total = (double)((noncix_end.tv_sec - noncix_start.tv_sec) + ((noncix_end.tv_nsec - noncix_start.tv_nsec) / 1.0e9)) / ITERATIONS;
if (memcmp(b, c, ARRAY_SIZE) == 0) {
printf("%s:\n", argv[0]);
printf(" CIX time: %.9lf seconds\n non-CIX time: %.9lf seconds\n", cix_total, noncix_total);
printf(" Speed-up: %lf\n", noncix_total / cix_total);
} else {
puts("Final arrays are not equal. Something happened.");
}
return 0;
}
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